[ja] 9 pages are out-of-date

[ymotongpoo]

Files to update

• content/ja/docs/concepts/glossary.md
• content/ja/docs/contributing/localization.md
• content/ja/docs/contributing/issues.md
• content/ja/docs/contributing/pull-requests.md
• content/ja/docs/collector/distributions.md
• content/ja/docs/collector/_index.md
• content/ja/docs/demo/architecture.md
• content/ja/docs/demo/feature-flags.md
• content/ja/docs/concepts/instrumentation/_index